A waterfilter made of glas or acrylic can filter small particles and cool down the vapor to get an even better vapor experience.
It is not necessary to use a water filter with a vaporizer. Even if you get some particles in your lungs, they are not small enough to remain there and your body will get rid of them in a natural way. Good water filters produce enough negative pressure to extract the herbs batch-wise, which results in a better extraction of the herbs.
Buy affordable water filters

Mobile vaporizers today have an accurate temperature control and a Li-Io battery. Some mobile devices come with a changeable battery.
The Flowermate 5.0 series is very popular. By now there are hybrid vaporizers that allow the use of both dry herbs and liquids for e-cigarettes in a tank, like the Flowermate Hybrid-X or the Boundless Hybrid. Grasshopper in pen size.
There are mobile oil dabbing devices in very small sizes like a e-cigarrettes, and even high end oil vaporizers like the Herkules.